Drafting instrument.



G. H. CARDELL.

DRAFTING INSTRUMENT.

APPLIGATION FILED 11111.20. 1911.

1 ,O1 5,423. Patent-,ea Jan. 23, 1912.

2 SHEETS-SHEET 1.

cuLUMBlA PLANDGRAPH CD.. WASMINQTON, D.

G. H. CARDELL.

DRAPTING INSTRUMENT. APPLICATION FILED MAR. 20, 1911. 1,015,423, Patented Janes, 1912-.

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UNITED STATES PTENT OFFICE. l

'GEORGE H. CARDELL, or `isz-nivo, N'vnnn'.'

DRAFTING INSTRUMENT.

Specicaton of Letters Patent. Y

To all whom tt may concern.'

Be it known that I, GEORGE H. CARDELL, a

`ycitizen of the United `States, residingat Reno, in the county of `Washoe and Statel of- Nevada, have invented certain new and use-` ful Improvements 1n Drafting Instruments, of which the following isa specication; Y

This invention relates to drafting instrn- 'y ments of the type shown in my Patent No.

984,347 issued February 14, 1911, and the principal object of the same is to provide an instrument in which the parts thereof are adjustably connected so that they canI be readily set to lay out patterns of'regu lar and irregular shape. f y

Preferred and practical embodiments of the invention are shown in the accompanying drawings wherein Figure 1 is a top plan-view of the im? Fig. 2 is a' proved drafting instrument. transverse sectional kview takenon the :line 2-2 of Fig. 1. Fig; 3 is a similar view taken on the line 3-3 Fig. 2. Fig-4 is a fragmentary sectional viewtaken on the line 4 4, Figp2. Fig. 5 is afragmentary longitudinal sectional view showing an end attachment for the main bar of the ,instru.

prises a straight elongated hollow bar 10I that is preferably rectangular in cross section and has one flat surface thereof provided with graduations designating inches and fractions thereof. Clamping plates 11 tr'ansversely overlap and are slidable" on bar l0, said plates being provided with flanges V12 at one end that are fastened to and hold..

disks 13 in contact withV onelongitudinal surface of said bar, and at an opposite end with pivot ears 14. Hollow bars 15 and 16,k

which are preferably rectangular infcross section, extend transversely of bar 10 and are straddled by clamping plates 17 that carryv disks 18, and pivot ears 19. Ears 14 and 19 are pivotally connected by the-bolts 20'which f extend through disks13 and 18, nuts 21 being carried by bolts 20 to lock the plates 11 and 17 together and also clamp said plates rigidly to the bars 1Q, e15, and 16. Bar 15 is longer than bar 16, and both bars are provided with graduations designating of the liparts.

Patented Jan. 23,1912. Application filed March 20,1911.`r SerialY No. 615,613.

.inches and yfractions thereof. yA pair of i clamping bands 22 slidably embraceV eaohof,

the bars 15 and16, and straddle the ends of illt flanges 23 carried by semicircnlar' scribingsegments 24.n Setscrews 251 are employed for adjustably lockingy the bands1 f are preferably formed offlat metal and are `arranged edgewise, and the inner surfaces of theirV outer edge portions are beveled, as

indicated at 26.

' 22 to the bars 15 and 16. The segments 24 .f

It will lbe clear from the foregoing de; ,l

scriptionY that bars 15 andy 16 can be moved longitudinally of barl 10 aswell as pivotally,

.and that the segments 24` can be adjusted' longitudinally ofthe bars 15 and 16, thus giving a wide range of relative adjustments In Fig. 8 the instrument'is l .sliowninL use, and it will be understood that the segments are .arranged Aon the bars 15 and16, so that saidbars have free lower end portionsthat are rocked across on edgey on the drawing boardf27 to cause the outer vlongitudinal edges `of the --segments which have been previously inked to mark the longitudinal lines on the drawing surface for The segments 24 are providedwit-h kregu.- l larly spaced threaded" transverse` openings 28 yfor the receptionof the screws 29 that hold the clamps 30 to said segments.' The clamps are arranged onthefinner surfaces of the segments 24 and have thickened an-l gularffree ends 31 that' are provided with. grooves 32 which are preferably V-shaped` `for holding vthe rods 33 ingradiating rela.`

The rods 33 have l pointed `v`beveled outer ends 34 that lie snuglyv against thebeveled portions 26 of the usegments. The clamps 30 permit the rods 23 to be tion on lsaid segments.

adjusted ,longitudinally and yit will be clear that their pointed endsY will penetrate the drawing'paper `and thereby lay out the pat f tern so that-inking of the outer edges yof the p rlhe in-Y 7ner surfaces of the segments 24 are lprovided segments 34 will not be necessary.

with laterally projecting lugs 35 which are Y engagedby the screws 36 that project beyond the scribing edges of said segments so ports when the instrument is rocked across the'drawing so that said scribing edges will not contact with the drawing. As will be obvious,` the .screws 36 are only usedwhen y that their heads 37 willserve as pivotal sup shaft 39 is rotatable therein. A head 40 and' a collar 41 prevent longitudinal movement of shaft 39 by contacting with the ends of block 38. The projected outer end of shaft 39 is enlarged and bifurcated as indicated at 43, and an end ear 44 of an arm 45 projecting from a sleeve 46 is pivotally mounted therein. The upper portion of sleeve 46 tapers longitudinally and is split and externally threaded to form a resilient clamp 47. A rod 48 extends through sleeve 46 and has a penetrating point 49 at one end for engaging' the drawing. Rod 48 is adjustably locked to sleeve 46 by the nut 50 that engages the clamp 47. Vith this construction it will be clear that the bar l0 can be rotated and vertically moved while the rod 48 is engaged with the drawing.

In Fig. 7 a modified form of the invent-ion is shown wherein penetrating rods 51 are held transverselyo the bars l5 and 16 by, and arel adjustable in, the clamps 52 that are locked to the said bars by the set screws 53.

In all forms of the invention, it will be vclear that the parts can be relatively adjusted and that the clamping means employed for connecting said parts are such that when fastened they hold the parts in rigid relation,

" llVhat I claim as my invention is 1. A drafting instrument comprising an elongated main bar, clamping members longitudinally adjustable on said bar, transverse bars, clamping members through which said transverse bars are longitudinally adjustable, means for pivotally connecting the clamping members and adapted to clamp the same upon the bars, and marking means carried by said transverse bars.

2. A drafting instrument comprising a main bar, ltransverse bars, clamps on the main bar, means for pivotally and longitudinally adjustably connecting the transverse bars to the clamps, and marking means adjustably connected to said transverse bars.

3. A drafting instrument comprising a main bar, clamps longitudinally adjustable thereon, transverse bars, clamps longitudinally adjustable thereon, means for pivotally connecting the clamps of the transverse bars to the clamps of the longitudinal bar, and marking means carried by the transverse bars.

4. A drafting instrument comprising a main bar, clamps longitudinally adjustable thereon, transverse bars pivotally and longitudinally adjustably connected to said clamps, semicircular segments having end flanges, means for adjustably locking said flanges to thel transverse bars, clamps carried by the segments, and penetrating means adustably mounted in and held in radiating relation on said segments by said clamps.

5. A drafting instrument comprising a main bar, transverse bars, clamps adjustable on the main bar, means for pivotally and longitudinally adjustably connecting the transverse bars to the clamps, clamping means longitudinally adjustable on the transverse bars, and scribing segments carried by the last mentioned clamping means.

6. A drafting instrument comprising a main bar, transverse bars adjustably connected thereto, clamping bands adjustable on said transverse bars, and scribing segments connecting said bands.

7. A drafting instrument comprising a main bar, clamping means adjustable thereon, transverse bars, means for pivotally connecting the transverse bars to said clamping means, scribing segments carried by said transverse bars, and rods radiating from said segments and provided with penetrating points.

In testimony whereof I atlix my signature in presence of two witnesses.

GEORGE I-I. CARDELL. lVitnesses I-I. C. Soi-momma, F. I. Soi-IROEDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

